Aerial receiving system for wireless signaling



Sept. 22, 1931.

'r.. s. THRELKELD ET AL AERIAL RECEIVING SYSTEM FOR WIRELESS SIGNALING Filed Feb. 2, 925

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70 REC Ell 1N6 APPARATUS 70 PEPE/VINE APPARA 77/5 INVENTOR G.THRELKELD $1 in; RFIELD Patented 'Sept.22, 1931i 7 UNITED STATES PATENT OFFICE mom oonnon' rlmarmn AND ARTHUR wrnnmwaron'r nur'rnarrmznor um- CHESTER, ENGLAND, nssrenons 'ro mmo oonrona'rron or AMERICA, A ooaro- RATION OI DELAWARE I Arum momma srsrmr roa wmnmss srezunme Application filed February 2, 1925, Serial No. 6,182, and in Great Britain February 8, 1924.

It is known that the reception of radio signals, especially the reception by amateurs of broadcast telephonic communications, is'apt to be impaired by local electric disturbances due, for instance, to electric traction systems in the vicinity, electric elevators in the same or nelghbormg bulldmgs, etc. Y

The object of this invention is to provide an aerial receiving system in which the efi'ect of such local disturbances maybe substantially obviated. I

According to this invention we provide a wire or series ofwires mounted parallel to and in proximity to the receiving aerial and grounded independently of the aerlal, .for instance, at the end opposite to that of the panying drawings in which:

Fig. 1 shows an aerial equipped with our device and Fig. 2 shows a modification thereof.

In Fig. 1 of the drawings a is the receiving aerial with the down-lead b, and c c are two wires mounted on each side of andparallel to the aerial a, and having their ends which are remote from the down-lead grounded.

Preferably the receiving aerial is provided with an earth mat or counterpoise (not shown). v

Fig. 2 shows a modification in which several wires such as 0 care employed, these being arranged along the edges of aprism along the axis of" which the aerial a lies. Ground wires connected to these wires are also arranged along the edges of a prism, and the down-lead b from the receiving aerialextends along the axis of that prism. i

Tuning and damping devices such, as the inductance d and resistances e e may be ina sorted in the earthing wires.

Preferably the shielding wires 0 c are, as shown, longer than the aerial c.

Having described our invention what we claim is 1. In combination, an aerial for a receiving ground connections of said leads theimpedance in at least one of said leads being purely resistive, the impedance in at least another of said leads including inductance.

2. In aerial receiving system means for shielding the antenna from local disturbance, which means consists of a plurality of conductors arranged about the antenna, each of sand conductors being grounded and having connectedwith them respectively an adjustable impedance solel adjacentthe ground connections the impe ance in at least one conductor being purely resistive and the impedance inatleast'another conductor including inductance.

3. In combination, an antenna, two or more I conductors supported" in parallelism to said antenna, a grounded lead connected to each of said conductors, and an adjustable impedance in each lead solely adjacent the ground connection of the lead, the adjustable impedance in one lead being purely resistive,

the adjustable impedance in another lead including inductance as well as resistance whereby the grounded leads will be given difierent characteristics so .as to eliminate more than one type of interference.

TOM GORDON THRELKELD.

ARTHUR WILLIAM WRIGHT BUTTERFIELD.

circuit, a plurality of conductors. supported 7 p I in parallelism to said aerial, grounded leads connected to said conductors, and. adjustable impedauces in said leads solely adjacent the 

